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Comparing libev/ev.c (file contents):
Revision 1.206 by root, Fri Jan 25 15:45:08 2008 UTC vs.
Revision 1.211 by root, Tue Feb 19 17:09:28 2008 UTC

1/* 1/*
2 * libev event processing core, watcher management 2 * libev event processing core, watcher management
3 * 3 *
4 * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de> 4 * Copyright (c) 2007,2008 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved. 5 * All rights reserved.
6 * 6 *
7 * Redistribution and use in source and binary forms, with or without modifica- 7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met: 8 * tion, are permitted provided that the following conditions are met:
9 * 9 *
… …
291typedef ev_watcher_time *WT; 291typedef ev_watcher_time *WT;
292 292
293#if EV_USE_MONOTONIC 293#if EV_USE_MONOTONIC
294/* sig_atomic_t is used to avoid per-thread variables or locking but still */ 294/* sig_atomic_t is used to avoid per-thread variables or locking but still */
295/* giving it a reasonably high chance of working on typical architetcures */ 295/* giving it a reasonably high chance of working on typical architetcures */
296static sig_atomic_t have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */ 296static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
297#endif 297#endif
298 298
299#ifdef _WIN32 299#ifdef _WIN32
300# include "ev_win32.c" 300# include "ev_win32.c"
301#endif 301#endif
… …
763/*****************************************************************************/ 763/*****************************************************************************/
764 764
765typedef struct 765typedef struct
766{ 766{
767 WL head; 767 WL head;
768 sig_atomic_t volatile gotsig; 768 EV_ATOMIC_T gotsig;
769} ANSIG; 769} ANSIG;
770 770
771static ANSIG *signals; 771static ANSIG *signals;
772static int signalmax; 772static int signalmax;
773 773
774static int sigpipe [2]; 774static EV_ATOMIC_T gotsig;
775static sig_atomic_t volatile gotsig;
776static ev_io sigev;
777 775
778void inline_size 776void inline_size
779signals_init (ANSIG *base, int count) 777signals_init (ANSIG *base, int count)
780{ 778{
781 while (count--) 779 while (count--)
… …
785 783
786 ++base; 784 ++base;
787 } 785 }
788} 786}
789 787
790static void 788/*****************************************************************************/
791sighandler (int signum)
792{
793#if _WIN32
794 signal (signum, sighandler);
795#endif
796
797 signals [signum - 1].gotsig = 1;
798
799 if (!gotsig)
800 {
801 int old_errno = errno;
802 gotsig = 1;
803 write (sigpipe [1], &signum, 1);
804 errno = old_errno;
805 }
806}
807
808void noinline
809ev_feed_signal_event (EV_P_ int signum)
810{
811 WL w;
812
813#if EV_MULTIPLICITY
814 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
815#endif
816
817 --signum;
818
819 if (signum < 0 || signum >= signalmax)
820 return;
821
822 signals [signum].gotsig = 0;
823
824 for (w = signals [signum].head; w; w = w->next)
825 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
826}
827
828static void
829sigcb (EV_P_ ev_io *iow, int revents)
830{
831 int signum;
832
833 read (sigpipe [0], &revents, 1);
834 gotsig = 0;
835
836 for (signum = signalmax; signum--; )
837 if (signals [signum].gotsig)
838 ev_feed_signal_event (EV_A_ signum + 1);
839}
840 789
841void inline_speed 790void inline_speed
842fd_intern (int fd) 791fd_intern (int fd)
843{ 792{
844#ifdef _WIN32 793#ifdef _WIN32
… …
849 fcntl (fd, F_SETFL, O_NONBLOCK); 798 fcntl (fd, F_SETFL, O_NONBLOCK);
850#endif 799#endif
851} 800}
852 801
853static void noinline 802static void noinline
854siginit (EV_P) 803evpipe_init (EV_P)
855{ 804{
805 if (!ev_is_active (&pipeev))
806 {
807 while (pipe (evpipe))
808 syserr ("(libev) error creating signal/async pipe");
809
856 fd_intern (sigpipe [0]); 810 fd_intern (evpipe [0]);
857 fd_intern (sigpipe [1]); 811 fd_intern (evpipe [1]);
858 812
859 ev_io_set (&sigev, sigpipe [0], EV_READ); 813 ev_io_set (&pipeev, evpipe [0], EV_READ);
860 ev_io_start (EV_A_ &sigev); 814 ev_io_start (EV_A_ &pipeev);
861 ev_unref (EV_A); /* child watcher should not keep loop alive */ 815 ev_unref (EV_A); /* watcher should not keep loop alive */
816
817 /* in case we received the signal before we had the chance of installing a handler */
818 ev_feed_event (EV_A_ &pipeev, 0);
819 }
820}
821
822void inline_size
823evpipe_write (EV_P_ int sig, int async)
824{
825 if (!(gotasync || gotsig))
826 {
827 int old_errno = errno; /* save errno becaue write might clobber it */
828
829 if (sig) gotsig = 1;
830 if (async) gotasync = 1;
831
832 write (evpipe [1], &old_errno, 1);
833
834 errno = old_errno;
835 }
836}
837
838static void
839pipecb (EV_P_ ev_io *iow, int revents)
840{
841 {
842 int dummy;
843 read (evpipe [0], &dummy, 1);
844 }
845
846 if (gotsig && ev_is_default_loop (EV_A))
847 {
848 int signum;
849 gotsig = 0;
850
851 for (signum = signalmax; signum--; )
852 if (signals [signum].gotsig)
853 ev_feed_signal_event (EV_A_ signum + 1);
854 }
855
856#if EV_ASYNC_ENABLE
857 if (gotasync)
858 {
859 int i;
860 gotasync = 0;
861
862 for (i = asynccnt; i--; )
863 if (asyncs [i]->sent)
864 {
865 asyncs [i]->sent = 0;
866 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
867 }
868 }
869#endif
870}
871
872/*****************************************************************************/
873
874static void
875sighandler (int signum)
876{
877#if EV_MULTIPLICITY
878 struct ev_loop *loop = &default_loop_struct;
879#endif
880
881#if _WIN32
882 signal (signum, sighandler);
883#endif
884
885 signals [signum - 1].gotsig = 1;
886 evpipe_write (EV_A_ 1, 0);
887}
888
889void noinline
890ev_feed_signal_event (EV_P_ int signum)
891{
892 WL w;
893
894#if EV_MULTIPLICITY
895 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
896#endif
897
898 --signum;
899
900 if (signum < 0 || signum >= signalmax)
901 return;
902
903 signals [signum].gotsig = 0;
904
905 for (w = signals [signum].head; w; w = w->next)
906 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
862} 907}
863 908
864/*****************************************************************************/ 909/*****************************************************************************/
865 910
866static WL childs [EV_PID_HASHSIZE]; 911static WL childs [EV_PID_HASHSIZE];
… …
1040 if (!clock_gettime (CLOCK_MONOTONIC, &ts)) 1085 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1041 have_monotonic = 1; 1086 have_monotonic = 1;
1042 } 1087 }
1043#endif 1088#endif
1044 1089
1045 ev_rt_now = ev_time (); 1090 ev_rt_now = ev_time ();
1046 mn_now = get_clock (); 1091 mn_now = get_clock ();
1047 now_floor = mn_now; 1092 now_floor = mn_now;
1048 rtmn_diff = ev_rt_now - mn_now; 1093 rtmn_diff = ev_rt_now - mn_now;
1049 1094
1050 io_blocktime = 0.; 1095 io_blocktime = 0.;
1051 timeout_blocktime = 0.; 1096 timeout_blocktime = 0.;
1097 backend = 0;
1098 backend_fd = -1;
1099 gotasync = 0;
1100#if EV_USE_INOTIFY
1101 fs_fd = -2;
1102#endif
1052 1103
1053 /* pid check not overridable via env */ 1104 /* pid check not overridable via env */
1054#ifndef _WIN32 1105#ifndef _WIN32
1055 if (flags & EVFLAG_FORKCHECK) 1106 if (flags & EVFLAG_FORKCHECK)
1056 curpid = getpid (); 1107 curpid = getpid ();
… …
1062 flags = atoi (getenv ("LIBEV_FLAGS")); 1113 flags = atoi (getenv ("LIBEV_FLAGS"));
1063 1114
1064 if (!(flags & 0x0000ffffUL)) 1115 if (!(flags & 0x0000ffffUL))
1065 flags |= ev_recommended_backends (); 1116 flags |= ev_recommended_backends ();
1066 1117
1067 backend = 0;
1068 backend_fd = -1;
1069#if EV_USE_INOTIFY
1070 fs_fd = -2;
1071#endif
1072
1073#if EV_USE_PORT 1118#if EV_USE_PORT
1074 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags); 1119 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1075#endif 1120#endif
1076#if EV_USE_KQUEUE 1121#if EV_USE_KQUEUE
1077 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags); 1122 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
… …
1084#endif 1129#endif
1085#if EV_USE_SELECT 1130#if EV_USE_SELECT
1086 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags); 1131 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1087#endif 1132#endif
1088 1133
1089 ev_init (&sigev, sigcb); 1134 ev_init (&pipeev, pipecb);
1090 ev_set_priority (&sigev, EV_MAXPRI); 1135 ev_set_priority (&pipeev, EV_MAXPRI);
1091 } 1136 }
1092} 1137}
1093 1138
1094static void noinline 1139static void noinline
1095loop_destroy (EV_P) 1140loop_destroy (EV_P)
1096{ 1141{
1097 int i; 1142 int i;
1143
1144 if (ev_is_active (&pipeev))
1145 {
1146 ev_ref (EV_A); /* signal watcher */
1147 ev_io_stop (EV_A_ &pipeev);
1148
1149 close (evpipe [0]); evpipe [0] = 0;
1150 close (evpipe [1]); evpipe [1] = 0;
1151 }
1098 1152
1099#if EV_USE_INOTIFY 1153#if EV_USE_INOTIFY
1100 if (fs_fd >= 0) 1154 if (fs_fd >= 0)
1101 close (fs_fd); 1155 close (fs_fd);
1102#endif 1156#endif
… …
1139#if EV_FORK_ENABLE 1193#if EV_FORK_ENABLE
1140 array_free (fork, EMPTY); 1194 array_free (fork, EMPTY);
1141#endif 1195#endif
1142 array_free (prepare, EMPTY); 1196 array_free (prepare, EMPTY);
1143 array_free (check, EMPTY); 1197 array_free (check, EMPTY);
1198#if EV_ASYNC_ENABLE
1199 array_free (async, EMPTY);
1200#endif
1144 1201
1145 backend = 0; 1202 backend = 0;
1146} 1203}
1147 1204
1148void inline_size infy_fork (EV_P); 1205void inline_size infy_fork (EV_P);
… …
1161#endif 1218#endif
1162#if EV_USE_INOTIFY 1219#if EV_USE_INOTIFY
1163 infy_fork (EV_A); 1220 infy_fork (EV_A);
1164#endif 1221#endif
1165 1222
1166 if (ev_is_active (&sigev)) 1223 if (ev_is_active (&pipeev))
1167 { 1224 {
1168 /* default loop */ 1225 /* this "locks" the handlers against writing to the pipe */
1226 gotsig = gotasync = 1;
1169 1227
1170 ev_ref (EV_A); 1228 ev_ref (EV_A);
1171 ev_io_stop (EV_A_ &sigev); 1229 ev_io_stop (EV_A_ &pipeev);
1172 close (sigpipe [0]); 1230 close (evpipe [0]);
1173 close (sigpipe [1]); 1231 close (evpipe [1]);
1174 1232
1175 while (pipe (sigpipe))
1176 syserr ("(libev) error creating pipe");
1177
1178 siginit (EV_A); 1233 evpipe_init (EV_A);
1234 /* now iterate over everything, in case we missed something */
1179 sigcb (EV_A_ &sigev, EV_READ); 1235 pipecb (EV_A_ &pipeev, EV_READ);
1180 } 1236 }
1181 1237
1182 postfork = 0; 1238 postfork = 0;
1183} 1239}
1184 1240
… …
1219#else 1275#else
1220int 1276int
1221ev_default_loop (unsigned int flags) 1277ev_default_loop (unsigned int flags)
1222#endif 1278#endif
1223{ 1279{
1224 if (sigpipe [0] == sigpipe [1])
1225 if (pipe (sigpipe))
1226 return 0;
1227
1228 if (!ev_default_loop_ptr) 1280 if (!ev_default_loop_ptr)
1229 { 1281 {
1230#if EV_MULTIPLICITY 1282#if EV_MULTIPLICITY
1231 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct; 1283 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1232#else 1284#else
… …
1235 1287
1236 loop_init (EV_A_ flags); 1288 loop_init (EV_A_ flags);
1237 1289
1238 if (ev_backend (EV_A)) 1290 if (ev_backend (EV_A))
1239 { 1291 {
1240 siginit (EV_A);
1241
1242#ifndef _WIN32 1292#ifndef _WIN32
1243 ev_signal_init (&childev, childcb, SIGCHLD); 1293 ev_signal_init (&childev, childcb, SIGCHLD);
1244 ev_set_priority (&childev, EV_MAXPRI); 1294 ev_set_priority (&childev, EV_MAXPRI);
1245 ev_signal_start (EV_A_ &childev); 1295 ev_signal_start (EV_A_ &childev);
1246 ev_unref (EV_A); /* child watcher should not keep loop alive */ 1296 ev_unref (EV_A); /* child watcher should not keep loop alive */
… …
1262 1312
1263#ifndef _WIN32 1313#ifndef _WIN32
1264 ev_ref (EV_A); /* child watcher */ 1314 ev_ref (EV_A); /* child watcher */
1265 ev_signal_stop (EV_A_ &childev); 1315 ev_signal_stop (EV_A_ &childev);
1266#endif 1316#endif
1267
1268 ev_ref (EV_A); /* signal watcher */
1269 ev_io_stop (EV_A_ &sigev);
1270
1271 close (sigpipe [0]); sigpipe [0] = 0;
1272 close (sigpipe [1]); sigpipe [1] = 0;
1273 1317
1274 loop_destroy (EV_A); 1318 loop_destroy (EV_A);
1275} 1319}
1276 1320
1277void 1321void
… …
1864#endif 1908#endif
1865 if (expect_false (ev_is_active (w))) 1909 if (expect_false (ev_is_active (w)))
1866 return; 1910 return;
1867 1911
1868 assert (("ev_signal_start called with illegal signal number", w->signum > 0)); 1912 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
1913
1914 evpipe_init (EV_A);
1869 1915
1870 { 1916 {
1871#ifndef _WIN32 1917#ifndef _WIN32
1872 sigset_t full, prev; 1918 sigset_t full, prev;
1873 sigfillset (&full); 1919 sigfillset (&full);
… …
2387 2433
2388 ev_stop (EV_A_ (W)w); 2434 ev_stop (EV_A_ (W)w);
2389} 2435}
2390#endif 2436#endif
2391 2437
2438#if EV_ASYNC_ENABLE
2439void
2440ev_async_start (EV_P_ ev_async *w)
2441{
2442 if (expect_false (ev_is_active (w)))
2443 return;
2444
2445 evpipe_init (EV_A);
2446
2447 ev_start (EV_A_ (W)w, ++asynccnt);
2448 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
2449 asyncs [asynccnt - 1] = w;
2450}
2451
2452void
2453ev_async_stop (EV_P_ ev_async *w)
2454{
2455 clear_pending (EV_A_ (W)w);
2456 if (expect_false (!ev_is_active (w)))
2457 return;
2458
2459 {
2460 int active = ((W)w)->active;
2461 asyncs [active - 1] = asyncs [--asynccnt];
2462 ((W)asyncs [active - 1])->active = active;
2463 }
2464
2465 ev_stop (EV_A_ (W)w);
2466}
2467
2468void
2469ev_async_send (EV_P_ ev_async *w)
2470{
2471 w->sent = 1;
2472 evpipe_write (EV_A_ 0, 1);
2473}
2474#endif
2475
2392/*****************************************************************************/ 2476/*****************************************************************************/
2393 2477
2394struct ev_once 2478struct ev_once
2395{ 2479{
2396 ev_io io; 2480 ev_io io;

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